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The CCD is quite sensitive to IR and the original lens has an IR filter built in . As you remove this lens you should to replace it with something else . You will find on bright objects ect there will be a bleeding of IR in the picture. It won't be as sharp as with out the filter. There is a web site some where which shows the difference with and with out on various objects. Also keeps the dirt off the CCD chip. One grain of dust is like a bolder in a picture.
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